docs: def check_addresses(address_list, is_remote=False):
      """
      Check if the format of the addresses is correct
  
      Arguments:
          address_list (list[tuple]):
              Sequence of (``str``, ``int``) pairs, each representing an IP
              address and port respectively
  
              .. note::
                  when supported by the platform, one or more of the elements in
                  the list can be of type ``str``, representing a valid UNIX
                  domain socket
  
          is_remote (boolean):
              Whether or not the address list
      Raises:
          AssertionError:
              raised when ``address_list`` contains an invalid element
          ValueError:
              raised when any address in the list has an incorrect format
  
      Example:
  
          >>> check_addresses([('127.0.0.1', 22), ('127.0.0.1', 2222)])
      """
      assert all(isinstance(x, (tuple, string_types)) for x in address_list)
      if (is_remote and any(isinstance(x, string_types) for x in address_list)):
          raise AssertionError('UNIX domain sockets not allowed for remote'
                               'addresses')
  
      for address in address_list:
          check_address(address)